IPA: /ˌɪn.sɪˈkjʊə.rɪ.ti/
KK: /ˌɪn.sɪˈkjʊr.ɪ.ti/
A feeling of uncertainty or lack of confidence about oneself or a situation.
Her insecurity about her appearance made her shy in social situations.
Insecurity → It is formed from "in-" (meaning not) and "securus" (from Latin, meaning safe or secure) and the suffix "-ity" (meaning the state or condition of). The word "insecurity" refers to the state of not being safe or secure.
Think of 'not' ('in-') being combined with 'safe' ('securus') to remember that 'insecurity' means the state of not being safe.